Respuesta :
Answer:
y = -13
a = -36
m = 18
Step-by-step explanation:
-7y=91
divide both sides by -7
-7y/-7 = 91/-7
y = -13
a/9=-4
multiply both sides by 9
9(a/9) = 9(-4)
a = -36
-1/2m=-9
multiply both sides by 2
2(-1/2m) = 2(-9)
-1m = -18
divide both sides by -1
m = 18